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Message-ID: <54219A22.2080208@t-online.de>
Date: Tue, 23 Sep 2014 18:04:50 +0200
From: Christian Franke <Christian DOT Franke AT t-online DOT de>
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To: cygwin AT cygwin DOT com
Subject: Re: ffs problem in windows64
References: <CAHAq8pG0xMtSLJYs_u8OW4Z1Loovpyzzyo4oLBZQPqYsWFUU6w AT mail DOT gmail DOT com> <54216D72 DOT 2070307 AT cs DOT umass DOT edu> <542175EF DOT 4040703 AT t-online DOT de>
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Christian Franke wrote:
> This segfaults if gcc -fno-builtin option is used:
>   ffs(0x80000000)
>
> These work:
>   ffs(0xc0000000)
>   ffs(0x40000000)
>
> Likely a subtle problem in table based ffs() implementation in 
> winsup/cygwin/syscalls.cc if only upper bit is set. The newlib version 
> of ffs() works.
>

https://cygwin.com/ml/cygwin-patches/2014-q3/msg00014.html


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